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Xylem and Phloem – Transport in Plants | Plants | Biology | FuseSchool

October 16, 2019


We could just say movement of water and minerals and movement of glucose and amino acids… But this is science, and so we like to have special terms to describe these processes! In these 3 part videos, we’re going to look at the transport systems in plants for moving food, water and minerals around. We have a beating heart and circulating blood, but what do plants do? Cut a plant open, and it doesn’t bleed. So what happens instead? Plants have their own systems. They have the Xylem which moves water and solutes from the roots to the leaves, and the Phloem which moves glucose, made in the leaves by photosynthesis, and amino acids to the rest of the plant. Here are the xylem and here are the phloem. Notice how the arrangement is different in the stem and the roots. The xylem and the phloem are found in groups called vascular bundles. And the position of these bundles changes for different parts of the plant. Both the xylem and the phloem are made up of rows of cells that form a continuous tube, running the whole length of the plant. The xylem vessels are made of elongated dead cells that are impermeable to water and have walls containing lignin (a woody material). Because of this, xylem vessels are tough. Which is why the vascular bundles in the roots are in the centre. They help prevent the plant being pulled out of the ground. They are also more protected in the centre. Whereas the stem has to resist being squashed and bent, and so it has the vascular bundles nearer to the edge to give the stem strength and support. The phloem vessels are made up of living cells. They transport sucrose and amino acids up and down the plant, depending upon where they are needed. Whereas, in the xylem the movement is just one way: from the roots up to the leaves. So we know that water and minerals go up the xylem, and amino acids and sucrose go up and down the phloem. But how? In the second part of this video we are going to look at the xylem and transpiration.

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28 Comments

  • Reply ΒΑΣΙΚΕΣ ΑΡΧΕΣ ΔΙΑΤΡΟΦΗΣ September 27, 2016 at 7:04 am

    perfect thanks!

  • Reply Hayyaan November 11, 2016 at 1:36 pm

    wonderful

  • Reply Katina Hoang November 16, 2016 at 6:07 am

    thank you! 🙂

  • Reply Wan Ting Loh January 31, 2017 at 11:17 am

    There is a mistake at 2:11… It should be sucrose and amino acids being transported down the phloem (as stated earlier in the video at 1:56), and not glucose and amino acids.

  • Reply Sai Yadav Sai Yadav February 26, 2017 at 7:09 pm

    TQ

  • Reply Melanie Schouten May 14, 2017 at 6:57 am

    When you have a biology test in 5 hours :/

  • Reply Ion May 25, 2017 at 12:49 pm

    shoutout to highfields biology class

  • Reply Moonlight Gomez June 17, 2017 at 10:43 am

    Can someone please tell me this background music? Ive been looking everywhere. Please

  • Reply diana alzareef June 29, 2017 at 2:48 pm

    thank you but I think it would be better if you slow down in explaining

  • Reply Chahat Vyas July 7, 2017 at 2:25 pm

    ok

  • Reply Anjali Mehra August 11, 2017 at 9:37 am

    I think u should tell in hindi

  • Reply syed nooruddin September 14, 2017 at 1:05 pm

    Ok but ,still more explanation was good.

  • Reply Ha mza September 20, 2017 at 6:05 pm

    Do u guys have an instagram because you should make one and post daily facts I would love that💯💯💯 pleaaaase reply

  • Reply feri dian September 23, 2017 at 5:34 am

    hope you're give blog about this, because i don't understand

  • Reply MANOHARAN S R October 24, 2017 at 1:54 pm

    Thank you so much for your help

  • Reply Andrew K Fletcher November 23, 2017 at 7:14 am

    Evaporation concentrates sugars produced by the leaf and nutrients and
    minerals from the soil. The sap at the leaf becomes denser. Gravity
    pulls dense sap down the tree in the phloem, under a positive pressure,
    generated by sucrose loading, which in turn generates a return flow of
    the less dense sap in the xylem, which flows upwards. A simple flow and
    return circulation that mirrors our own circulation. Discovered in 1994
    and dutifully ignored by academia ever since. Trees and plants circulate
    sap!
    In 1995, I demonstrated how water in a single open ended tube
    caused water to flow up to 24 metres, using 10 and 50 ml of salt
    solution, witnessed by Senior Forestry Commission scientists and
    management, along with journalists.
    What I did with this discovery is now helping people to regain control of their health.
    Google inclined bed therapy or Andrew K Fletcher and open your minds

  • Reply Amirreza Behnia December 21, 2017 at 12:02 pm

    But can you photosyntesize tho ?

  • Reply D.K .V January 7, 2018 at 4:40 pm

    thanks, 😀😀👍👍

  • Reply raj kumar January 18, 2018 at 12:51 pm

    thanks

  • Reply Ibrahim Gamer January 29, 2018 at 6:44 pm

    FuseSchool is an awesome education teaching process, which makes people understand brilliantly, and its better than Khan Academy

  • Reply Jimbob Staggs February 13, 2018 at 6:10 pm

    The 22 disliked are the ones who failed the biology tests

  • Reply lightwell sol February 16, 2018 at 2:14 pm

    really nice it helped me

  • Reply Sam kk857jj February 17, 2018 at 3:18 am

    Good

  • Reply tyler durden March 3, 2018 at 10:30 am

    So good

  • Reply Valentin Ershov April 3, 2018 at 9:32 am

    My biology teacher and Chemestry teacher both use these videos to teach us therefore I can catch up on the lessons I've missed. Very useful and very simple. Excellent for GCSE revision!

  • Reply Sarikaa Singhh May 30, 2018 at 4:24 am

    Really grateful….

  • Reply Liam Toal June 4, 2018 at 9:56 am

    Shoutout to my science teacher for showing us this video

  • Reply Leon S. Kennedy June 5, 2018 at 9:09 am

    Your channel clearly needs more exposure.

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